http://www.sendacow.org.uk/africangar... Keyhole Gardens are a great garden to make - here is one being built in Uganda. This organic technique is part of Send a Cow's training in sustainable agriculture and is a great home garden idea too. Keyhole gardens survive floods and arid conditions well as the raised bed holds moisture and is 'fed' grey water and compost via a central basket. Help more African families learn how to make these gardens and buy the charity gift of a Keyhole Garden for a friend at http://www.sendacowgifts.org.uk/​build-a-keyhole-gardenhttp://www.sendacow.org.uk